Hadi B. answered • 04/03/19

Sacramento math tutor on the go

mailing 7 packages that each weigh 1 oz. will cost 7(.54) = $3.78

make an equation to calculate the cost of mailing a package that weighs more than 1 oz.

f(x) = .54 + .43(x - 1)

we use x-1 because the first ounce is accounted for by the .54

to mail a package that weighs 7 oz. solve for f(7)

f(7) = .54 + .43(7 - 1) = .54 + .43(6) = .54 + 2.58 = $3.12

so it costs 3.78 - 3.12 = $.66 more